[LLVMbugs] [Bug 7636] New: thumb2 ldmia.w used as a return doesn't write back SP

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Jul 13 14:12:39 PDT 2010


           Summary: thumb2 ldmia.w used as a return doesn't write back SP
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: ARM
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: bagel99 at gmail.com
                CC: llvmbugs at cs.uiuc.edu

When a ldmia.w is generated that includes the PC in the register list,
it doesn't update the stack pointer, e.g.:

    ldmia.w    sp, {r4, r5, r6, r8, pc}
should be:
    ldmia.w    sp!, {r4, r5, r6, r8, pc}

Strangely, in case where the register list contains LR instead of PC, the write
back is done.

A test case has to be sufficiently complicated to use ldmia.w rather than pop.
I have not attached one.  If one is needed, let me know.

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